JPH01284067A - Reader - Google Patents

Abstract

PURPOSE:To easily read a small sized transmission original such as a photo film or the like by lighting the transmission original from an external light source arranged at the upper part of a holder so as to read the transmission optical image with higher density than that of a read section reading a reflected light image of an opaque original by means of a high density read section. CONSTITUTION:A high density read section 9 having a read width of 1/5-1/10 of the read width of a low density read section 8 and whose lengthwise direction is placed in parallel with the lengthwise direction of the low density read section 8, that is, in the main scanning direction of an original platen glass 2 is arranged to the left side of a light source 70. In case of reading the reflected original at a high density, a high density read unit 9 is moved to a desired position of an opaque original on the original platen glass 2 in the main scanning direction by driving a stepping motor 72. Then the direction of the aperture is set in the light source 70 so as to be projected to a position B and the image of the position B is formed on a solid-state image pickup element 92 by a read lens 91 by the irradiation with the light from the light source 70 similarly to apply main scanning and the motor is driven to apply subscanning.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reading device for reading original documents in an image forming apparatus such as a copying machine, and more specifically to a reading device capable of reading photographic film.

[Prior art]

Copying machines have been developed that produce large-sized copies from transparent originals, such as slide films (for example, Japanese Patent Application Laid-open No. 198439/1983). Recently, digital copying machines that can read originals with image readers and process the image information as electrical signals have become popular, and with this, it has become possible to perform positive inversion from normal photographic film, that is, negative film. A system has also been developed that facilitates this process and also allows large-sized copies to be obtained.

[Problem to be solved by the invention]

By the way, when obtaining a large-sized copy from photographic film as mentioned above, it can be obtained by reading the film image in the same way as a normal original and enlarging it using an optical system or signal processing, but if the film image is small Therefore, enlarging the image reduces the resolution. For this reason, to read a film image, the film image is enlarged and projected onto a document table using a projector, and the enlarged projected image is scanned by an exposure lamp or, for example, a CCD. As a result, a large space is required on the document table for an optical path for enlarging and projecting a film image by a projector, resulting in an increase in the size of the apparatus.

The present invention has been made in view of the above circumstances, and provides a reading device that can be miniaturized by not using a projector or the like, and that can easily read small transparent originals such as photographic film with high resolution. The purpose is to provide.

[Means to solve the problem]

A reading device according to the present invention includes a reading section that reads a reflected light image of an opaque original placed on a document table using irradiated light from a light source provided inside the reading device, and reads a plurality of transparent originals. A holder to be held side by side on the same surface is placed near the document table, and the holder is placed so that the side-by-side direction of the transparent original is aligned with the main scanning direction or the sub-scanning direction of the document table, and the document surface is turned inside. a fixing part that faces and fixes the original; an external light source that is arranged on the upper part of the holder and illuminates the transparent original; and an external light source that is provided inside and arranges the transparent original in parallel so as to face each of the transparent originals of the holder. The present invention is characterized by comprising a high-density reading section that moves in the direction and reads the transmitted light image of the transparent original at a higher density than the reading section.

[Effect]

With multiple transparent originals held side by side on the same surface by a holder, align the direction of the transparent originals near the document table with the main scanning direction or sub-scanning direction of the document table, and align the document surface. It is fixed so that it faces inside. The high-density reading unit provided inside is moved in the direction in which the transparent originals held in the holder are arranged side by side so as to face each of the transparent originals separately. The transparent original is illuminated by an external light source placed above the holder, and its transmitted light image is read by the high-density reading section at a higher density than the reading section that reads the reflected light image of the opaque original.

〔Example〕

The reading device according to the present invention (hereinafter referred to as the device of the present invention) includes:
Equipped with four reading modes depending on the type of document.
First, in mode 1, a normal opaque original is irradiated with light and an image is read using the reflected light. Mode 2 similarly reads opaque originals, but it reads at a higher density than Mode 1, and this was designed to prevent the resolution of the image from decreasing when obtaining an enlarged copy. It is something. Mode 3 is for reading a relatively large transparent original, such as a transparent sheet for 0IIP, and its reading density is equivalent to mode 1. Mode 4 is a mode related to the main part of the present invention, and is for reading a small transparent original, that is, a photographic film, with high density, similar to the purpose of mode 2.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof. 1 and 2 are external perspective views of the apparatus of the present invention, in which the reading apparatus main body 1 is provided with an original platen glass 2 on the upper surface, and an operation panel 3 and the mode 4 at the front end thereof.
Each of the rectangular openings 4 has an opening 4 (see FIG. 2) that is used when reading photographic film. It is provided to match the width direction of the device main body 1. Opening 4
As shown in FIG. 1, a seat plate 40 for mounting a film holder 5 and a light box 6 is provided at the peripheral edge of the opening 4 at a position lower than the top surface of the document table glass 2.
There are holes 4 in the vicinity of both corners near the document platen glass 2.
1.41 was established. Further, on the front side edge of the opening 4, a plurality of photo-interchangers 42 for detecting the position of the light box 6, which will be described later, are arranged in parallel at equal intervals.

The opening 4 is normally sealed with a lid (not shown) when the film holder 5 and light box 6 are not attached, that is, when mode 4 reading is not performed.

FIG. 3 is a perspective view showing the internal structure of the reader main body 1. At the inner bottom of this, a pair of rails 10a having a length slightly shorter than the width of the reader main body 1 are provided.

The rails 10b are arranged opposite to each other with their elongated directions aligned with the width direction of the reader main body 1, and the rails 10a.

On 10b, a rectangular parallelepiped-shaped reading head 7 having a depth slightly shorter than the depth of the reading device main body 1 is placed in a straddling state with its longitudinal depth direction orthogonal to the extending direction of each of the rails. A booth I is placed on the rails 10a and 10b and is driven by a motor 13, respectively.
Moon 1a, llb and wire 12a stretched between them
, 12b on the rails 10a, 10b in the width direction of the reader main body l, that is, in the left-right direction.

FIG. 4 is a longitudinal cross-sectional view of the reading head 7 taken in a direction perpendicular to the depth direction and viewed from the front, and FIG. 5 is a perspective view showing the internal structure of the reading head 7. The reading head 7 has an opening formed in the center of its upper surface over the entire length in the depth direction, and a glass Fj, 74 is sealed in the opening. A low-density reading section 8 used in modes 2 and 4, and a high-density reading section 9 used in modes 2 and 4.
A light source 70 made of, for example, an aperture-type fluorescent lamp, whose axial length direction coincides with the depth direction of the reading head 7, is arranged near the glass plate 74. The light source 70 has a length substantially equal to the length in the depth direction of the original platen glass 2, and is mounted on the back side of the reading head 7 so as to face the lower surface of the original platen glass 2 through the glass plate 74. It is installed with one end close together. The low-density reading section 8 is disposed on the right side of the light source 70, and the low-density reading section 8 is connected to an imaging element (lens) 81 and a solid-state imaging element 82, each having approximately the same length as the light source 70. The light incident side of the imaging element 81 is placed facing the glass plate 74, and the solid-state image sensor 82 is placed oppositely below the light output side. In other words, the low-density reading section 8 is configured so that its longitudinal direction coincides with the depth direction of the document table glass 2 to perform main scanning on the document.

The left side of the light source 70 has a reading width of 115 to 1/10 of the reading width of the low-density reading section 8, and its longitudinal direction is parallel to the longitudinal direction of the low-density reading section 8, that is, the document platen glass. A high-density reading section 9 is arranged in the main scanning direction of No. 2, and the high-density reading section 9 is composed of a reading lens 91 and a solid-state image sensor 92. Similarly, the incident side of the reading lens 91 is connected to a glass plate. 74, and a solid-state image pickup device 92 is placed oppositely below the emission side. Reading lens 91
For example, a converging Rondo lens is used, and this is because solid-state imaging devices for high-density reading have lower sensitivity than those for low-density reading. /N ratio. The high-density reading unit 9 is a rectangular box-shaped high-density reading unit 90 whose one end is inserted through a shaft 73 that is disposed parallel to the axial direction of the light source 70 over the entire length of the reading head 7 in the depth direction. It is equipped inside,
The high-density reading unit 9° is provided with a roller 93 on the side surface opposite to the insertion portion of the shaft 730 so that its rotation axis is perpendicular to the longitudinal direction of the shaft 73, and is provided in the reading head 7. Boo'J71a, 71b driven by a stepping motor 72 and a wire 75 stretched between them
Therefore, it is configured to move in the axial length direction of the shaft 73, that is, in the depth direction of the reading head 7.

Now, in the above configuration, reading operations in modes 1, 2, and 3 will be explained. First, when reading an opaque original in mode 1 at low density, the direction of the aperture is set so that the light source 7° emits light to the position A shown in FIG. Then, the light from the light source 70 is irradiated onto the lower surface of the opaque original placed on the document platen glass 2, and this diffusely reflected light is imaged on the solid-state image sensor 82 by the imaging element 81 of the low-density reading section 8. , performs main scanning by electrically scanning, and obtains one line of image information. Furthermore, by driving the motor 13, the reading head 7 is moved in the width direction of the reading device main body l, thereby performing sub-scanning of the original image. Here, the image reading density by the low-density reading section 8 is 10 to 20 pixels/frame.

Next, if you want to read the reflective original in mode 2 at high density, first move the high density reading unit 90 to the stepping motor 72.
is moved to a desired position of the opaque original on the original table glass 2 in the main scanning direction. The direction of the aperture of the light source 70 is set so as to project light to the position B shown in FIG. Main scanning is performed by forming an image upward, and sub-scanning is performed by driving the motor 13. The image reading density by this high-density reading section 9 is 50 to 200 pixels/dragon.

When reading a large transparent original at low density in mode 3, a light hood shown in FIG. 6 is used. Figure 6 shows
FIG. 3 is a longitudinal cross-sectional view showing a state in which the light hood is attached to the reading device main body 1. FIG. The light hood 10 placed on the document table glass 2 of the reading device main body 1 has a square pyramid shape, and is equipped with a light source 11 at the top of the light hood 10, and a heat-insulating filter arranged below the light hood 10 to direct the light from the light source 11. 12 to diffuse irradiation to the bottom side. A Fresnel lens 13 and a transmission diffusion plate 14 are arranged in a laminated manner at the bottom, and the lower surface side of the transmission diffusion plate 14 is placed opposite to a transmission original (not shown) placed on the original platen glass 2. be. The transmission diffuser plate 14 is provided to alleviate illumination unevenness such as an annular shadow of the Fresnel lens 13. Reading of the transparent original is performed by the low-density reading section 8 in the same manner as in mode 1.

As described above, in all modes 1 to 3, an original is placed on the original platen glass 2 and the original image is scanned.

Next, the structure of the film holder 5 and light box 6 for reading photographic film in mode 4, which is the main part of the present invention, will be explained. 7 and 8 are external perspective views showing the structure of the film holder 5. The long plate-shaped film holder 5, which is fitted into the opening 4 of the reader body 1, has an image of the film in the center. Rectangular openings 50a and 50b whose short sides are approximately equal in length to the width.
It is constructed by integrally bonding a presser foot 5a and a substrate 5b, each having a holder, and by changing the way these are bonded, it is possible to insert and hold both a slide film or a normal negative film between the two members. It looks like this.

FIG. 7 shows a case where a slide mount containing a slide film is held, and the board 5b has recesses 51b and 5 in which the slide mount is inserted and placed on the upper surface of the board 5b.
1b are formed in two places each on the side edge portion in the length direction of the opening 50b, that is, in two places, for a total of four places, and the recess 51
b is the depth of the recess 51b such that when the slide mount is inserted and mounted, the height of the top surface of the slide mount is lower than the top surface of the substrate 5b. Pins 58 and 58 are placed near both corners on the front side of the top surface of the board 5b, and pins 59 and 59 are placed near both corners on the back side of the bottom surface.
(See Fig. 8) are provided in a protruding manner. The holding plate 5a has convex portions 51a fitted in the concave portions 51b of the base Fi5b at four locations (see FIG. 8) on its lower surface, and an opening 50a.
The protruding height of this convex portion 51a from the lower surface of the presser foot T1.5a is determined by the height of the slide when the slide mount is inserted into the concave portion 51b of the substrate 5b. The length is set to be approximately equal to the length from the top surface of the mount to the top surface of the substrate 5b. At a position between the convex portion 51a and both edges in the length direction of the presser plate 5a, there is a length that is slightly shorter than the length of the presser plate 5a and whose longitudinal direction is slightly bent in the longitudinal direction of the presser plate 5a. Hole-shaped guide holes 52 and 52 are formed to penetrate in the thickness direction.

A groove 550 is formed in the front side surface in the longitudinal direction of the presser plate 5a, and the groove 550 is made flat in the longitudinal direction.
550 has recessed holes 55, 55 having a hole diameter larger than the groove width.
．． ... are drilled at equal intervals. Holes 53, 53 into which the pins 58, 58 of the substrate 5b are inserted are formed in the vicinity of a portion of both corners on the front side, passing through in the thickness direction.

When holding a slide mount with the film holder 5 configured as described above, first, the slide mount (not shown) is inserted and placed in the recesses 51b, 51b of the substrate 5b. Then, the convex portions 51a, 51a of the presser plate 5a are fitted into the recesses 51b, 51b, and the pins 58, 58 of the substrate 5b are fitted into the holes 53,53 of the presser plate 5a, thereby connecting the presser plate 5a and the substrate 5b. Combine with. As a result, the slide mount is held at its side edges,
Openings 50a and 50b are located in a direction perpendicular to the screen of the image portion of the slide film, so that both sides of the image are exposed to the outside.

FIG. 8 shows the case of holding a negative film, that is, a film cut into a predetermined number of frames (usually 5 frames) to be stored in a storage negative case. The surface of the substrate 5b and the surface opposite to the surface shown in FIG. 7 are used.

The substrate 5b has a concave portion 57b in the widthwise center portion of the upper surface (lower surface in FIG. 7) that is wider than the width of the opening 50b and has a bottom portion having a width approximately equal to the film width.
It is formed over the entire length of b. Similarly, in the vicinity of a portion of both corners on the near side of the upper surface, as described above, the bottles 59 and 59 are protruded. A convex portion 56a, which is fitted into the recess 57b, is formed on the lower surface (upper surface in FIG. 7) of the presser plate 5a, extending along the entire length of the presser plate 5a. The front side surface of the holding plate 5a, that is, the groove 550
A groove 560 and a recessed hole 56 having exactly the same structure are formed on the side surface opposite to the side surface where the recessed holes 55, 55... are formed.
,56. ...is formed. The bins 59. of the substrate 5b are located near a portion of both corners on the front side, that is, near a portion of the corner where the holes 53 are formed and a portion of the corner on the opposite side.
Holes 54 and 54 into which the screws 59 are inserted are formed to penetrate in the thickness direction.

When holding a negative film with the film holder 5 configured as described above, the film is held in the recess 5 of the substrate 5b.
7b and place it there. And a convex portion 56a of the presser plate 5a
is fitted into the recess 57b, and the pin 59 of the substrate 5b is fitted into the recess 57b.
．． 59 are fitted into the holes 54 and 54 of the presser plate 5a to connect the presser plate 5a and the substrate 5b. As a result, the winding hole portion and both ends of the film in the length direction are sandwiched, and the openings 50a and 50b are located in the direction perpendicular to the screen of the image portion of the film, so that both sides of each image are exposed to the outside. Let me come.

FIG. 9 is an external perspective view showing how the light box 6 is attached to the film holder 5, and FIG. 10 is a longitudinal sectional view taken along line X-X showing the internal structure of the light box 6.
shows the state in which the slide mount is held. . The light box 6 has a rectangular parallelepiped shape with a bottom that is approximately the same size as the slide mount 100 held by the film holder 5, and has pedestals 68a and 68b extending from both ends of the bottom in the depth direction. Each pedestal 68a,
A protrusion (not shown) provided on the lower surface of the film holder 5 is fitted into a guide hole 52, 52 formed in the holding plate 5a of the film holder 5, so that the film holder 5 can be moved in the longitudinal direction. Further, a recess 69 is formed in the bottom portion over the entire length in the width direction, that is, in the moving direction, to engage with the projection 57a located on the upper surface of the presser plate 5a when holding the slide film.

A positioning plate 66 for selecting a film image to be illuminated and a light shielding plate 67 used for detecting the position of the light box 6 on the film holder 5 are attached to the pedestal 68a. The positioning temporary 66 is bent like a leaf spring from the upper surface of the pedestal 68a to the lower side of the light box 6, and a hemispherical protrusion provided at the center of this is engaged with a groove 550 formed on the side surface of the holding plate 5a. It is designed to slide as the light box 6 moves,
The film image is positioned by fitting the slide film OO into the recessed hole 55 provided based on the arrangement position in the longitudinal direction of the film holder 5 and the arrangement interval of each frame of the negative film. The light shielding plate 67 protrudes forward from the upper surface of the pedestal 68a, and when the light box 6 and the film holder 5 are installed in the opening 4 of the reading device main body l, the light shielding plate 67 is inserted into each of the photointerrupters 42. The position of the light box 6 on the film holder 5 is detected by intervening in the optical path provided in the vertical direction and blocking light.

As shown in FIG. 10, the inside of the light box 6 includes a light source 61 for film illumination on the top thereof, a heat shield filter 62 on the bottom side thereof, and a cooling fan 65 on the negative side. A collimator lens 63 and a transmission diffusion plate 64 are arranged in a laminated manner at the bottom, and the lower surface of the transmission diffusion plate 64 is configured to face the film of the film holder 5.

The operation of reading an image on a photographic film using the film holder 5 and light box 6 constructed as described above will now be described. First, the operator holds either the slide film or the negative film with the film holder 5 as described above, and after attaching the light box 6 to it, or if attaching it later, the operator opens the reader main body 1 as it is. It is installed in section 4. This attachment is performed using the bins 58 and 58 located on the lower surface side of the substrate 5b depending on the film held.
, or 59.59 by fitting into said hole 41.41 provided in the seat plate 40 in the opening 4.

Then, by moving the light box 6 attached to the film holder 5 in the longitudinal direction of the film holder, the light box 6 is positioned on a desired image.

On the reading device side, by setting the reading mode of mode 4 on the operation panel 3 in advance, the high-density reading unit 90 in the reading head 7 is moved to be located below the opening 4 on the nearest side. I'll keep it. Then, the position of the light box 6, that is, the position of the image to be read, is detected by the photo iterator 42, and the 10th
As shown in the figure, the reading head 7 is moved in the sub-scanning direction to shift the high-density reading section 9 of the high-density reading unit 90 to the reading start position of the image. When this is finished,
The light source 61 of the light box 6 is turned on to illuminate the image, and the high-density reading section 9 starts reading the transmitted light image.

In this embodiment, the film holder is configured so that its longitudinal direction matches the sub-scanning direction of the reading device, and an opening is provided in the front part of the top surface of the reading device to mount the film holder. It may also be configured to be mounted, for example, on the left side of the top surface of the reading device so as to match the main scanning direction. In this embodiment, an aperture-type fluorescent lamp is used as the light source when reading a reflective original, but instead of this, a structure may be used in which the direction of the reflective shade of a halogen lamp is changed, and a reflective original can be read at a high density. If the illuminance of the light source is insufficient for reading, an auxiliary light source may be provided. Further, in this embodiment, a convergent rod lens is used in the high-density reading section, but if the amount of light is sufficient, a through lens may be used to configure the zoom optical system.

Furthermore, although a photointerrupter is used to detect the position of the light box on the film holder, the present invention is not limited to this, and a microswitch or the like may also be used. In addition, in this embodiment, the number of slide mounts that can be held in parallel on the film holder is two, but it goes without saying that a structure that can hold two or more sheets may also be used.

〔effect〕

As described above, in the reading device according to the present invention, when reading a small transparent original such as a photographic film, a high-density reading section provided separately from a reading section for reading ordinary non-transparent originals and a small external light source are used. Read the transmitted light image. As a result, a high-resolution read image can be obtained without the need to enlarge and project the film image using a projector.
It is possible to prevent the device from becoming larger due to the use of a projector. A holder holding a long negative film having a plurality of images or a plurality of slide films arranged side by side is fixed near the document table, and a high-density reading section is moved to a desired image in the holder. This reduces the space required to move the holder when adopting the opposite configuration, that is, the reading section is fixed and the desired image is selected by moving the holder. There is no inconvenience that the work space is narrowed due to the margin. Furthermore, by fixing the holder so that its longitudinal direction, that is, the direction in which the film images are arranged side by side, coincides with the main scanning direction or sub-scanning direction of the document table, it is possible to move the holder when providing a high-density reading section. The present invention has excellent effects, such as being able to share the drive system and operation system with the existing reading section, minimizing the increase in parts, and suppressing cost increases. .

[Brief explanation of the drawing]

1 and 2 are external perspective views of a reading device according to the present invention, FIG. 3 is a perspective view showing its internal structure, FIG. 4 is a vertical sectional view of the reading head, and FIG. 5 is a perspective view of its internal structure. A perspective view showing,
Figure 6 is a longitudinal sectional view showing the light hood installed.
8 and 8 are external perspective views of the film holder, FIG. 9 is an external perspective view showing how the light box is attached to the film holder, and FIG. 10 is a longitudinal cross-sectional view taken along the line X--X. 1...Reading device main body 2...Original table glass 4...
・Opening 5...Film holder 6...Light box 7...Reading section 8...Low density reading section 9
...High-density reading section

Claims (1)

[Claims] 1. In an apparatus equipped with a reading unit that reads a reflected light image of an opaque original placed on a document table using irradiated light from a light source provided inside the apparatus, a plurality of transparent originals can be read. A holder to be held side by side on the same surface, and a holder placed near the document table so that the side-by-side orientation of the transparent original in the holder matches the main scanning direction or the sub-scanning direction of the document table, and the document surface is turned inside. a fixing part that faces and fixes the transparent originals; an external light source that is disposed on the upper part of the holder and illuminates the transparent originals; and an external light source that is provided inside and arranges the transparent originals side by side so as to face each of the transparent originals of the holder separately. A reading device comprising: a high-density reading section that moves in a direction and reads a transmitted light image of a transparent original at a higher density than the reading section.